The 45-year-old implied that it is no longer acceptable to be a UK size ten if you are working as a model.
She said: "I think when I was modelling, size six (UK size ten) was a normal size and now it's like two (UK six) or zero (UK four)."
The mother-of-two implied that she has a responsibility to her children to show them how to live a healthy lifestyle.
She suggested that they are influenced by her "healthy choices" and by the fact that both her and her husband exercise.
On her website, Crawford explains that she likes to changes her workouts so that she does not get bored and enjoys keeping fit by hiking, doing Pilates, taking a dance class or jumping on a trampoline.